Conodont biostratigraphy, paleobiogeography, and depositional environments reveal detailed eustatic changes and paleogeography of the Sibumasu terrane during the Ordovician. Based on lithologic data, the Ordovician sequences on the Sibumasu terrane are classified into two types. One was deposited in the Thong Pha Phum-Li basin, which extends from northern to western Thailand, and the other formed in the Tarutao-Langkawi basin ranging from southern Thailand to northern Malaysia. Five regressive events, RE 1 to 5, and a transgressive event TE 1 are recognized in these basins. On the basis of the conodont biostratigraphy, RE 1, 2, 4, and 5 are correlated with the Peltocare Regressive Event, the Ceratopyge Regressive Event, the Basal Whiterockian Lowstand interval, and the global regression caused by the end-Ordovician glaciation, respectively. TE 1 continued through Darriwilian time. The faunal affinity of Ordovician conodonts makes it clear that the Sibumasu terrane was close to both Australia and North China, which were located in low paleolatitudes. The Darriwilian transgressive event, TE 1, led to a remarkable conodont faunal change from a shallow-water to a deeper, cool-water assemblage.
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